/Engine/Plugins/Experimental/AnimNext/Source/AnimNext/Public/Param/ParamStack.h
Get a mutable reference to the value of a parameter given aFName. Using theFParamIdoverload will avoid having to hash theFNameto recover the ID.
a mutable reference to the parameter's value. Function asserts if the parameter is not present
template<typename ValueType> ValueType & GetMutableParam ( [FName](API\Runtime\Core\UObject\FName) InKey, [FParamStack::EGetParamResult](API\Plugins\AnimNext\Param\FParamStack\EGetParamResult) * OutResult )